Peripheral I/O

General Purpose Input/Output (GPIO) - Use this
API for simple sensors such as motion detectors, proximity detectors, and level
switches that report their current state as a binary value—high or low.

Pulse Width Modulation (PWM) - Use this API for
servo motors, DC motors, and lights that require a proportional signal to
provide fine-grained control over the output.

Serial Communication - Use these APIs to transfer larger payloads of data
between two or more smart devices connected on the same local bus. The following
table outlines the basic attributes of each supported serial protocol: